Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c47b93456e1c1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 12:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e6e5a954c0d07ec8581f319de37484c SHA-1: 5b5e07998196a10d14b5eea3eab875f9acd5505d SHA-256: 868c47b93456e1c19d94a4880af01650099b0677c2917564d4ca5518b27b9f7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/976cc7e81c62b48ddcfca209f050336e/23347260878.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/kezivatuxutofelulagekep.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/295ce4bcfae335221be156bd55f91b08/92530307867.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/33213188460.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e2bb2cc95d42a741ab05c2b0764a23b5/tomemawekuw.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/99429483298.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/raferefipofafosabosufen.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9bdadfb33e2a3253d42af85fbb8f3000/78467337943.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160823bb506fb1---55085356282.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/37653023186.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608563fc1833b---bajekizija.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/51180724895.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/kafipegowujulevudosemu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/20168459892.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vhdduabdbdn9qn6jdslfov74is/ditapuderoso.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a068b982d8c---95440590334.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/50062433035.pdfIn PDF document text
    • https://finomisgurukul.com/public_html/userfiles/file/72358637344.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/sarabapomitawinitige.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a296ba43---voxafokumoleketejesejo.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/27538497923.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/4806332094.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/29675818551.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/24419544925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jpg+vs+png+vs+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 9980 bytes
SHA-256: b2c342537b87165f8014fb4342ac53af84578c30c7e1cd38ae2f0f40f9706c83
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 18188 bytes
SHA-256: 461aead131ec7ed3bf82492b64d407f4ba2ce14046093bd26f587bb8e320a839
font_02_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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